CISIII wiring diagram (Knock Light)

[Alexander van Gerbig]

    I tried testing my knock sensor in a similar fashion, didn't seem to do
anything.  Pinging must be a very specific noise that the knock sensor is
specifically looking for and the hammer doesn't quite do it.

    Though I surely know that the knock light was working when I had the
spark timing all wacky.  When jumping on the gas hard the light came on and
the power literally shut off in the 80.  Maybe you should give that a shot,
turn that timing too far advanced and rev the engine, might be enough to
trip full retard and the light should pop on, watch out for the pinging if
you really do have a busted knock, but usually if you pull the codes a bad
knock will show up.

    Yes the knock light is the ECS light!  When you hit FULL retard the
light stays on as long as full retard is being held, or until you restart
the car.  Mind you this was on my CIS-Motronic 80, but I bet CIS-E III has
the same function, Bentley says it does.

Cheers!

Alexander van Gerbig
'91 200q20v (Crunched)
'90 90q20v (Sport)
'88 80t (R.I.P)

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